PIC16F877-04/P【PDF 8/218 页】IC MCU FLASH 8KX14 EE 40DIP

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2001 Microchip Technology Inc.

DS30292C-page 103

PIC16F87X

10.2.3

SETTING UP 9-BIT MODE WITH

ADDRESS DETECT

When setting up an Asynchronous Reception with

Address Detect Enabled:

Initialize the SPBRG register for the appropriate

baud rate. If a high speed baud rate is desired, set

bit BRGH.

Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

If interrupts are desired, then set enable bit RCIE.

Set bit RX9 to enable 9-bit reception.

Set ADDEN to enable address detect.

Enable the reception by setting enable bit CREN.

Flag bit RCIF will be set when reception is com-

plete, and an interrupt will be generated if enable

bit RCIE was set.

Read the RCSTA register to get the ninth bit and

determine if any error occurred during reception.

Read the 8-bit received data by reading the

RCREG register, to determine if the device is

being addressed.

If any error occurred, clear the error by clearing

enable bit CREN.

If the device has been addressed, clear the

ADDEN bit to allow data bytes and address bytes

to be read into the receive buffer, and interrupt the

CPU.

FIGURE 10-6:

USART RECEIVE BLOCK DIAGRAM

x64 Baud Rate CLK

SPBRG

Baud Rate Generator

RC7/RX/DT

Pin Buffer

and Control

SPEN

Data

Recovery

CREN

OERR

FERR

RSR Register

MSb

LSb

RX9D

RCREG Register

FIFO

Interrupt

RCIF

RCIE

Data Bus

÷ 64

÷ 16

STOP

START

(8)

RX9

ADDEN

RX9

ADDEN

RSR<8>

Enable

Load of

Receive

Buffer

FOSC

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